Electrical apparatus



Dec 27, 1938. R p LANSlNG 2,141,357

ELECTRICAL APPARATUS Filed June 25, 1932 INVENTOR. Fa umona P Lana/)7 A TTO 50 disposed with their vertical portions at right Preferably a compression spring I39 is coiled 50 Patented Dec. 27; 1938 I UNITED STATES PATENTIOFFICE.

ELECTRICAL APPARATUS Raymond P. Lansing, Montclair, N. J., assignor,

by mesne assignments, to Eclipse Aviation Corporation, East Orange, N. J.. a corporation of New Jersey Application June 25, 1932, Serial No. 619,329

6 Claims. (Cl. ZOO-87) This invention relates to electromagnetic apthereon, includes weighted members 99 and paratus, and more particularly to the mechanical II00 secured to the armature on opposite 7 construction of such apparatus. sides of line of axis of the upstanding ears or lugs The object of the invention is to provide irni0l which receive the pin I02, by which the armovements in the mechanical construction and mature is suspended in the bearing members 62,

serviceability of electromagnetic apparatus. above described. As shown, the weights I 00-!00 These improvements are of particular "utility in addition to their function (if acting as a counwhen applied to an electromagnct of the type ter-balance for the weight 99, also serve to hold adapted to alternately make and break one or the movable switch element I04 in spaced re1amore electrical circuits, but it will be apparent tion to the armature 6i. As shown, the switch from the following specification and the appendelement I04 is composed of a series of laminaed claims that the invention is not limited to tions of conducting material held together by such application, as the improvements hereinsuitable means I05 and I06, the latter being after recited are also capable of embodiment in shown as a rivet which alsoholcls in place a conany electromagnet of the specified character tact button I01, adapted to engage a correspondwhether for switch ope-ration or for other pur-' ing button I08 riveted to a conducting terminal D BS- bar I09 which serves for attachment of a lead In the accompanying drawing, wherein the of one of the circuits to be more fully described, preferred embodiment of the invention is illusand is in turn supported on a plate I I2 to which trated, and wherein like reference characters the upper end of the core 56 is peened, as indi- 20 refer to like parts throughout the views: cated at II 3, and which forms, with said core Fig. 1 is a vertical longitudinal sectional view part of the magnetic circuit; the bar I09 being intaken on the line I-I of Fig. 3; sulated by members II4, attached to plate II2 Fig. 2 is a view in elevation at right angles to by suitable means such as screws H5, shown in the viewpoint of Fig. 1; and Fig. 3. 25

Fig. 3 is a top plan view of the parts shown Supplementing the weight 99 in opposing the in Figs. 1 and 2, one of which is broken away to tendency of the armature 6i to move toward the clarify the illustration. core 56 upon energization of the electro-magnet In the drawing the electromagnet is shown as is a. tension spring II8, the upper end of which mounted on and supported by a bracket 51 that is held to a finger II9, depending from the outer 30 is suitably attached to the panel 38. Surrounding portion of the armature BI, the lower end of the the core 56 are a pair of coils 58 and 59, the spring being received in aJectangular block l2! formerpreferably being of heavy wire and the adapted to have limited movement within an latter being formed of several turns of fine wire, opening in the upper leg of a U-shaped bracket the two cells being wound in opposite directions I23, the central portion of which is secured to 35 with one superimposed on the other, as indi'- the member 9I by suitable means I24, which also cated in Fig. 1. Extending acrossthe upper end serves to secure and hold a pawl I2! in locking of core 56 is an armature BI with which is associrelation to the serrated edge of an adjusting disc ated novel means whereby it is suspended for I28 which turns with a screw I29. The screw I29 limited oscillation in bearing surfaces formed in has a shank which extends through the lower 40 a U-shaped block 62 riveted as indicated at 63-, leg I3I of the U-shaped bracket. Formed in this to the vertical leg of the L-shaped plate 9|, the shank is a threaded socket I32 engaging a corlower leg of which is apertured to receive the rerespondingly threaded end I34 of the block I2I duced end 92 of the core 56. Screws 93 passing so that upon turning of the screw I29, a raising through mounting bracket 51 hold the plate 9| in or lowering of the block I2I, and hence a varia- 45 position beneath the base plates 94 and 95 of the tion in the tension of the spring H8 is effected; unit, while a similar screw 91, aided by a memthe pawl I21 acting to hold the weight in the adber 98, secures the core to the L-shaped memjusted position by virtue of its locking engageber 9I the members 51 and 9I being preferably ment with the disc I29.

angles, as shown best in Fig. 2. about the shank of the screw I29 so that its The novel means for suspending the armature upper end presses upon disc I40. The disc in GI to permit limited movement thereof about its turn bears against the under surface of the block pivot connection in response to the resultant of I2I and thus yieldably opposes the gravitational the opposing electro-nrcxynetic force exerted, force of the block. Inaddition to this yieldable opposition, there is also provided a positive stop limiting the extent of oscillation of the armature Si in one direction, such stop being shown in the form of a bent strip I43, the upper end of which is normally in contacting relation to the under surface of the armature SI, and the lower end of which is secured to the member 9i by suitable means, herein shown in conjunction with the strip I46 secured to the plate 9I as by rivets I45; the said strip I46 serving for the attachment of the ends of leads I48--I48, as shown at I53-I53, the other ends of which are secured to clips I4II4I of a bar I42 riveted in conjunction with the laminated contact piece I04, and weights I--I00, to the armature 6|, as indicated at I52 in Figs. 3 and 5. One of the clips I53 may also serve for the attachment of the lead I54, to which one end of the winding 58 is secured.

In order to make it possible to readily remove the armature GI and the parts assembled therewith and without the necessity of interfering with the main unit, the pin I02 from which the armature is suspended is preferably bent at an approximate right angle, as indicated at I! in Fig. 5, the outer end thereof being held between the concave surfaces of a pair of resilient detents I59 and I60, shown best in Fig. 4, the said detent being secured in any suitable manner, preferably being clamped between the weight 99 and armature BI, as indicated at 99 in Fig. 3.

When the electromagnetic switch shown in the drawing is applied to the control of a battery charging circuit, it is. in the nature of a reverse current relay, the current or series coil being the one indicated at 58, while the voltage or shunt coil is the one indicated at 59. Coil 58 normally assists coil 59 in holding contacts I0I I08 more firmly closed than said contactscan be held by the shunt coil alone. If the amount of current delivered to the battery or load circuit decreases, due for example to a decrease in the speed of'the generator armature, there is a tendency for current to flow from the battery through the series coil 58, whereby the latter sets up a field which coacts with spring II8 to open contacts I01 and I08. After these last named contacts are opened, the current for the load circuit is provided by the battery, but the charging of the battery is automatically resumed as soon as the voltage through shunt coil 59 is sufliciently high to again close contacts I01 and I08 against the tension of spring II8.

'What is claimed is:

1. In apparatus of the class described, a magnet, a support therefor, an armature pivoted to said support, a pair of weights mounted on said armature on opposite sides of the pivotal axis thereof and tending to maintain equilibrium therein, a removable pivot pin for journaling" said armature in said support. and means associated with ,one of said weights for yieldably holding said pin against axial displacement.

2. In apparatus of the classdescribed, a magnet, a support therefor, an armature pivoted to said support, a pair of weights mounted on said armature on opposite sides of the pivotal axis thereof and tending to maintain equilibrium therein, a removable pivot pin for journaling said armature in said support, and means associated with one of said weights for yieldably holding said pin against axial displacement, said holding means also acting to hold said pin against rotary movement, except in synchronlsm with said armature.

3. In apparatus of the class described, a magnet, a support therefor, an armature pivoted to said support, a pair of weights mounted on said armature on opposite sides of the pivotal axis thereof and tending to maintain equilibrium therein, a spring catch extending from said armature, and a pin engageable with said catch for security and ready removal, said armature being suspended from said pin.

4. In apparatus of the class described, a magnet, a support therefor, an armature pivoted to said support, a pair of weights mounted on said armature on opposite sides of the pivotal axis thereof and tending to maintain equilibrium therein, a coiled spring connecting with said armature to assist said weights in maintaining said armature in a predetermined position, a third weight secured to the end of said spring remote from said armature, said weight acting to maintain said spring at the predetermined tension, and additional resilient means opposing the gravitational force on said third weight and thereby damping the vibrational tendencies thereof.

5. In apparatus of the class described, a magnet, a support therefor, an armature pivoted to said support, a coiled spring connecting with said armature to tend to maintain said armature in a predetermined position, a weight secured to the end of said spring remote from said arma ture, said weight acting to maintain said spring at the predetermined tension, and additional resilient means opposing the gravitational force on said weight and thereby damping the vibrational tendencies thereof. 1

6; In apparatus of the class described, a magnet, a support therefor, an armature pivotedto said support, a tensioned spring connecting with said armature to tend to maintain said armature in a predetermined position, a weight acting to maintain said spring at the predetermined tension, a threaded extension on said weight, said extension being disposed concentrically of said weight, a member engageable with said threaded extension to regulate the tensioning eflect of said weight upon said spring, and a second spring surrounding said threaded extension and acting as a cushion for said weight.

RAYMOND P. LANSING. 

